Graphite is a solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite

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Is a non–crystalline substance

Is an allotropic form of diamond

Has molecules of variable molecular masses like ploymer

Has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak inter plate bonds

answer is D.

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Detailed Solution

In graphite, carbon atoms are arranged in large plates of rings of strongly bound carbon atoms with weak inter-plate bonds. Therefore graphite is difficult to melt and is a solid lubricant.

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